We had one of those on the farm, I think it was a US made 'Glover' mounted on an Australian sheep shearing plant. My Dad and his brother used drive this around in the back of an old Buick (converted to a pickup) and shear all the sheep over a wide area. They earned enough to raise their families and buy quite sizeable farms too. The machine is still in the family, nicely restored and my brothers and cousins do occasional exhibitions with it.